This is the unreleased Game Boy Color version of 40 Winks. There are 6 playable levels, the last 2 of which need to be unlocked by completing levels 4 and 5. Not much is known about this prototype, but it appears very similar to a build once showcased by Hard4Games.
Pressing SELECT while in a level activates a debug player state.
UPDATE 3/31/26: The ROM we previously released is discovered to have been a bad dump. We have uploaded the good dump here, and the bad dump remains along with it for posterity.